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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4934862aae57458a9b8cd79e90bd88b86fdba2b1de50d19ec999b412e0c85d9' 
  AND token = 'hkLNinoMr7MezptHVRdsh3Hf58fJz9cwgoFNGKxVPqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}