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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '104b42d144c575a0634e47e126be90feb78da8c292063ae27b265ea866b93932' 
  AND token = 'g3smHVC1xIsgiV5+k30Am2f25cPVtIwhvpE20D0YAcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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