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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e733cba780597ebf01481152d68b84492afa4fa591a40d2b59a7e7e4e2c05a79' 
  AND token = '2nQYcAEZAiN5YMsKMC+P0YCv0ir3WYbo0QCPiBoWTN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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