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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9126c744502c86bb97c377c6f46dfe76b25c8643f9e850ce00f10ca3ba53b89a' 
  AND token = '1NuRjrbfYUsE/HZpyFeptGf0CmTPrl8RIEQkHEK9Jm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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