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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84569af55d2347b404c7a763d3366885fcf038eeaabbcbf0f3cbfe802cf1e51c' 
  AND token = 'zr8z7W5kiQvFoU9tbW0dN5eXVC+pv74KBGLRT3dABJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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