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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdc20a2520f87d2d58a81f8eda8ae3e6a5ea610861d9fea124a67c87c4d3ee86' 
  AND token = 'gnjMA/8HrFOg9c/iP8T9Ow/HNH/A/tgmp1fnfHFTZQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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