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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a854bc8c11f4c9f243cf27e5cb74b54f8beb758d295c2273aff981bf96ba5c10' 
  AND token = '1OVoLcmSG68x7bs+ufIcngLGwxgvwTjezFk7TNsmgwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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