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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d1cd8a2bb308118ea1ba90cdad9c3b18ab8ecff43d0a5f6c1d277528272f037' 
  AND token = '6KixUyp5l3Mx5T0CtplohBMAdvb6YF72OPw5uxOEtpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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