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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02c18f1e3db05517b23085d3eba5604b9b86089f88357b10701267d55bba5179' 
  AND token = 'jA16vSb/8mRzJ3iIFd+qycfvr0mb5US4ReScxRwbL8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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