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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c70d7c2a1a10b313619b940b27c6dd4eaa43211043a99d09effbc2f3af47befe' 
  AND token = 'lWsPo0OKARQsF37dZQzw0h0dxs5KPrkEmRBT/PHYqcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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