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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4bb3654cf0d4eb7c8c7a4ff8cf96ba2d522b0d6a5150f02415ba4d6f04e8ed5' 
  AND token = 'XyxBGWFXv6wx4h6ntWAsEod/mPsiaUwdakapMd7eI3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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