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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '823a69d2d4576bdb7332afdcc0bbc58f9380a0e6e06e439a014a291692161ebf' 
  AND token = 'jnL6Pr9VmNm8LlwWXbkTLKECaiyNFK+3Lu9OA7HBy4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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