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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebaf224c0cfd034d631a8dd128b1cf280a48bc21c87dbd1f4700c17bae73f2c7' 
  AND token = 'MiNYDFvoK9L5W6HJ909ipgSyGVTuDHy644Pfhv9K4GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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