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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1147b07a5b4e311500653b0e9fe6ba2ef28a10e3e3cfca026ff3c4d41a81a5f' 
  AND token = 'uRGsN9SCxdIPT05AqPECDDKQqWf7eChY9tsfcISyYyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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