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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85a82a405e2fe5e6c14cd80d41bcd33e012c8dbd617c56ab78260a08a1571cad' 
  AND token = '9bDWjDaHpGCDzT6TjasQJ7iBwCJgIDXTy5QFW+YS9QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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