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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85f55f051fa0a402e43230f76440c0c4ed017fa3b37c86efeb5227402ea3c90c' 
  AND token = 'Mkb7VhVOvNO6fRhkydTnKV57OjsRioLzm890CEr/APk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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