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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9587827bd734068d9040a6ec76b86f95569e75da31d00538d2809b30bcf6f74d' 
  AND token = 'oF+QD7DVjQ0agqNEK/2UejbrXviPE6S3v29tnNnfdbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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