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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '559af79dd97a255aebaa3298cc70ab2fad0c016b8dfa5cab556e0709c7045427' 
  AND token = 'WiCEBnxtEvwn3y647Rday0wUitiObtEi2VJGKxtNS40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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