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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30b81d13dbbfb9011bbafebc5dd1a71fe6bb2a8f3df9b491071e280fbd351647' 
  AND token = 'kllSSGZU17opKqeVVUEpUZ5w4RR7G8DYQEMUf65R6Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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