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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1de24f224781f09b99ae66f71b86d1ae7567a2916ae060721a5a9d9cacb1171c' 
  AND token = 'mJPhbMRKYWsDi+FaoHe55U5DsuPQZGajLfHnJMaJkmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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