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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90baec2701cfe141571a310a276c0ce8d9d555f469b56384a051259fe1ddef37' 
  AND token = '+j6Z0CficHk3LQqil4s+A7Irx4pmRqhxzDjHN3xeLls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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