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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f21768b309b5618c92f3ab213dd98321e1f17a9bc2b8e9382fdab57423b146af' 
  AND token = 'zbb5E/vsj4bFi7OUWowGPe2PK43PQa1lhj7NArIMWyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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