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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d3570a733b9613163ae7d05fe9879d5d59f2d1efaa3e2f21550aa1e0e784532' 
  AND token = 'PeEVpDNXkHRFXPdI+Gt3YUKYOzHbw6//kYIwUsRBoHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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