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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cc87cf84528c48fe56b8e9a17264e1049dede9f515da42456f85d873021db03' 
  AND token = 'q4By91HanYjffZTye9ztzvqQgF9PHDTMlCY0WkAo87E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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