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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0c193a341a66f64bed9f2c6152f1ea0156e3d05668289fb60b97ca12f6b7379' 
  AND token = 'k4CZpa+uVaA08atiOlgAT/76sd/Byvst8fqD8UFfnXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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