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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78f5503fd634485e399ff7878488f71dae08b7216a6d57f9ba00ef7a59d9bcea' 
  AND token = 'UENuYyELvoiOkGjaY2JHIGrf4sCuKpnNIdm1Wqx0O8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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