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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '101db21f4f65b3c420db99a455375014e13742d120675c51d1f275277b5c281a' 
  AND token = '38tp+dut8ucdDQBknSl/HU5/WUzqCotXTYks5n8AlVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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