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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd60e8fc946308a963499d24e6f4e52c5bb8b22c3a7e97fa394ee522c86fd385c' 
  AND token = 'XwtAG1RZfTYaDTMeuFGH23v8TFmQnQYd0tVdmTA1l30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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