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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4d3a0946d7b8c161cd58d5c9b93cdfb77c93d7541daa77d748722a1fe3a0887' 
  AND token = 'u7nL4n3ybpdIFmqnoWhWeejIApyT9xEOzFxGdr0e6Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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