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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '937945a3aea3bc41dd95ca9c788c81c02c5f97aee69c32540b61b982340506ef' 
  AND token = 'tam/szlthsp8GNUfrRy41EMoKro8zSl6cBiTQcVRgSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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