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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5924de383c4f4897ad84431789e39b2459a6581188f3f6ad786bf4ba9a5e5c72' 
  AND token = 'hnQ4muRc885v0bui0f9XB5R2t56Hu3uUobrQNcVjw+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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