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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5d93f376af7a7bec386353f53d9d3e9fc05952780d1e18d8959c37b220d026b' 
  AND token = 'olZ5Iv2qrjgRThvOjsMu84T4oeqK1fu3RD5j1mKOyok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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