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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2d47d61a9fc67f9aa4300f1cfd1a9d06343cf1308d98c8c97ab9c7d47a455b1' 
  AND token = 'KFwqZbiyn1orwGEe7ky/8BbhKA8I62rSSU/EmybbqOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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