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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2875fd684cc3821f3f11e0066ec10576643849fe9a16b8b7800476304eb490cd' 
  AND token = '5kLbsCZP1PUwS1UkrMuPEvTOwbH9JYMvERSxDc3OT64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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