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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fc0631c9d80c0d3102f1737b32c2dc42220a0ec76086add4d1df3a4730519f4' 
  AND token = 'kWfQqGIkTbbDpYun3Lgq9vHFDGYEig5GmC5L2z4/v7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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