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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3dbf49507a8e1e9260134a2a194d26e0332e3a5cc40e6097fbe160ba15d3707' 
  AND token = 'HMLx0FPSMaGUZop6hfNTEMPcJoV3MdIs11q1vn4yC6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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