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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6b1be957b1a5286b2c3239acd9960b85bfa990941aeea129c579cf8201d66a8' 
  AND token = '8wj1abKMZfUs0PVenKDC0QAXnfzX2gSRIRkcIapxM0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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