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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02713563d7c06ee0632fa0bfb37d3e9487147ab06540d4de4a522789682e85e8' 
  AND token = 'Q84nLu+BeNrCDyD3vkH0fTov4kb49yoemLCN/xjA80s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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