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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '632b250032d23fc0b6dbde11a01b383b96eaed84524f30623a0e51b0ea74bdfa' 
  AND token = 'hpde/PSkSJMxunBU+6VEjHI2oBL5Okccc12SZ7jTTPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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