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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10c8ee338f0107167a75835b3acb2ec164b512de6e68a49759060a32ad2696bb' 
  AND token = '2jfeIJSneDc5cK1ObqKrRbz1retaFW6MF52sq+IFA08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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