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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3d0949085741dd383c80ee99c58362f4852f4d18ad1d30703e31546467f8e86' 
  AND token = '7QIQRf8+rQs5sb1YHoGc1d9oQ4tJWH81IrYhxGmC7UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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