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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3090ae212a19b7631a502635244e0184838d33cfafd5be1198d50139a2163e58' 
  AND token = 'sozwerkL/TfkQL6Rwa6Xob1Y8gSSTQ1sB2j/UJcLNyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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