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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '088f324ae1e34b2404f97213e1a052047ca5eaf35185f9fbe917a35b0ea28f01' 
  AND token = 'fWmJ9oOl6LyRpQFUgeEOnFrcciwdKwM838tTAC2SbeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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