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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9b60d53ac294a12891234606c5b8220d21f93bc155ce61912dc10326611e2c4' 
  AND token = '+EYcT9MskdIbNF99wFCs3lWgUggAhkzjDwc1w14BZVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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