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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f7bf27a66abf9c9407f271891e324b6ca61883ccd0e38b8d4e5a605d762417d' 
  AND token = 'HtXoaoYSiagFQi6ERvFa5aVTTOzTsI1JyoQxOGEStpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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