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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8e56af0a1d6c7a6a1c281d63b94181f78b300a8ef19e8b250be7270bda3288b' 
  AND token = 'M51hdZIpnQusYPsEklt0mZ7ud9zS2JD+U1VZSRpg2qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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