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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd87c7533c64aa932ac25582561ef17730332a151b01847d52c672293d9e3be2b' 
  AND token = 'S/TIM/CUx59/ztNkEJQcijKK5/tnPZcjAUo6Qd88/AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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