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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee0f46ec756a1081ec4e95250e1f8f70841a51b9f1d678f351b6ff56f89b9bbf' 
  AND token = 'VBFlT1Hwj3Vy+wqw8aVblVb8kbCSNEEXX5U1L/Se/zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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